Inorganics
·
2016
·Vol. 4
·期 3
·24
·
IF 0
Fengdong Qu,Bo He,Rohiverth Guarecuco,Minghui Yang
Composite materials, which can optimally use the advantages of different materials, have been studied extensively. Herein, hybrid tungsten nitride and oxide (WN/WO3) composites were prepared through a simple aqueous solution route followed by nitriding in NH3, for application as novel sensing materials. We found that the introduction of WN can improve the electrical properties of the composites, thus improving the gas sensing properties of the composites when compared with bare WO3. The highest sensing response was up to 21.3 for 100 ppb NO2with a fast response time of ~50 s at room temperature, and the low detection limit was 1.28 ppb, which is far below the level that is immediately dangerous to life or health (IDLH) values (NO2: 20 ppm) defined by the U.S. National Institute for Occupational Safety and Health (NIOSH). In addition, the composites successfully lower the optimum temperature of WO3from 300 °C to room temperature, and the composites-based sensor presents good long-term stability for NO2of 100 ppb. Furthermore, a possible sensing mechanism is proposed.Keywords:WN/WO3composite;nanosheets;gas sensor;NO2;room temperature
✓ 已验证
产品关联
DOI
IONICS
·
2015
·Vol. 21
·期 12
·3239-3244
·
IF 1.754
Wu Lianlian,Xia Jinfeng,Wu Jian,Li Qiang
Layered-structure Bi 2 W 2 O 9 powders synthesized by conventional solid-state reaction and treated by ball milling have been used to create an electrode for a mixed-potential-type NO 2 sensor with yttria-stabilized zirconia as an oxygen ion conductor. This sensor was found to provide good sensitivity to NO 2 at 500 °C, thanks to the grain refinement induced by ball milling. The electromotive force generated was linear to the logarithm of NO 2 concentration in the range of 30–500 ppm, with analysis of the impedance spectroscopy revealing a similar linear correlation between the conductance of the electrode and the logarithm of NO 2 concentration. The influence of CO 2 was also examined and found to have little effect on the sensitivity of the sensor.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Xiangyu Zang,Zhaoyan Zhang,Yingqi Zhao,Gang Li,Hua Xie,Weiqing Zhang,Guorong Wu,Xueming Yang,Ling Jiang
Elucidating the effects of anthropogenic pollutants on the photooxidation of biogenic volatile organic compounds is crucial to understanding the fundamental mechanisms of secondary organic aerosol (SOA) formation. Here, the impacts of NO 2 and SO 2 on SOA formation from the photooxidation of a representative monoterpene , β -pinene, were investigated by a number of laboratory studies. The results indicated NO 2 enhanced the SOA mass concentrations and particle number concentrations under both low and high β -pinene conditions. This could be rationalized that the increased O 3 concentrations upon the NO x photolysis was helpful for the generation of more amounts of O 3 -oxidized products, which accelerated the SOA nucleation and growth. Combing with NO 2 , the promotion of the SOA yield by SO 2 was mainly reflected in the increase of mass concentration, which might be due to the elimination of the newly formed particles by the initially formed particles. The observed low oxidation degree of SOA might be attributed to the fast growth of SOA, resulting in the uptake of less oxygenated gas-phase species onto the particle phase. The present findings have important implications for SOA formation affected by anthropogenic–biogenic interactions in the ambient atmosphere.
研究领域:
大气科学
·
环境科学
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 3
·1095-1109
·
IF 3.134
Deng Renjie,Zeng Manlin,Tian Yao
A novel heterogeneous catalytic system was developed for the preparation of para -nitrobromobenzene ( p -NBr) with nitrogen dioxide (NO 2 ) as nitrating agent in the presence of oxygen (O 2 ). By applying Hβ zeolite as the catalyst, p -NBr can be obtained with high conversion (85.7%) and selectivity (91.7%). In addition, it can be recycled at least five times without a significant decrease in catalytic activity, which demonstrates its high efficiency, good stability and regenerability. Meanwhile, DFT study explained the regioselectivity for the nitronium (NO 2 + ) nitration via electrophilic process, which support the experimental conclusion. Graphical abstract
研究领域:
催化
·
有机化学
·
理论化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Xiang Jincheng,Zhang Zhengxin,Li Xiang,Yang Li,Guo Shenghui,Xia Yi
The detection of nitrogen dioxide (NO₂) at room temperature is crucial for environmental monitoring and public health, but achieving high sensitivity and selectivity remains a challenge. In this study, we developed an In₂O₃/MoS₂ gas sensor via the electrostatic self-assembly method for NO₂ sensing. Owing to the addition of MoS 2 , the composite sensitive materials obtained an increased the specific surface area and improved charge transfer ability. Therefore, the In₂O₃/MoS₂ compsites exhibited enhanced NO₂ sensing performance compared to the pure In₂O₃ nanoparticles.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Ruilong Ma,Wenchao Gan,Yuanhu Zeng,Shuanglong Feng,Shukai Duan,Peter Feng,Xiaoyan Peng
The demand for gas sensors is experiencing rapid growth, driven by the increasing need for air quality detection in the face of environmental pollution and industrial emissions. However, the widely used metal oxide semiconductor (MOS) gas sensors suffer from drawbacks such as low ability to predict gas concentration and poor selectivity . In this work, a sensor array was fabricated consisting of 10 various gas sensors and combined with an advanced deep learning algorithm to achieve precise predictions of nitrogen dioxide (NO 2 ) at low concentrations. First, graphitic carbon nitride (g-C 3 N 4 ) and In 2 O 3 nanoparticles were composited with different mass ratios, resulting in the formation of distinct g-C 3 N 4 /In 2 O 3 composites as sensing materials. Afterward, SEM, TEM , and XRD were employed to characterize the morphology, structure, and elemental composition of the samples. Furthermore, sensing properties including response, selectivity , and repeatability, are studied for 10 gas sensors based on g-C 3 N 4 /In 2 O 3 composites. Finally, the convolutional neural network-efficient channel attention-gate recursive unit (CNN-AGRU) model was proposed to analyze the patterns of the signals collected from the sensor array when exposed to various NO 2 concentrations from 1 to 9 ppm. The results demonstrated the integration of high-selectivity sensing materials to NO 2 and an advanced deep learning algorithm CNN-AGRU enables to realize a high concentration prediction accuracy of about 97.04% and a low prediction error of 0.20527 ppm for NO 2 gas.
研究领域:
材料科学
·
环境科学
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Shiyong Zhang,Zhenlong Zhao,Lihua Jia,Xiangfeng Guo,Rui Yang,Qingfang Deng,Desheng Zhang
Nitric oxides emission, especially nitrogen dioxide (NO 2 ), has aroused a series of environment and ecological problems and damaged human health, it is of great significance to monitor the NO 2 concentration in the atmosphere. However, developing the real-time NO 2 sensors remains challenge due to high working temperature, limited sensitivity at the low temperature and poor selectivity. Hence, we designed and synthesized the SnO 2 -M-O V - T sensors through thermal treating the Sn metal organic frameworks (Sn-MOF), and the prepared SnO 2 -M-O V - T sensors exhibits the excellent sensing performance under a low operating temperature. The response value of SnO 2 -M-O V -300 sensor for NO 2 could reach 11677 at 120 °C, that is 100 times than pristine SnO 2 , and the response value of 170 was also achieved even at the low temperature of 50 °C. In addition, the SnO 2 -M-O V -300 sensor also showed the good cyclicity and stability for NO 2 detection. Density functional theory results show that both the oxygen vacancy and Sn atom act as the adsorption and active sites during the process of NO 2 gas sensing, yet the role of oxygen vacancy prefers the adsorption and charge transfer for NO 2 than of Sn atom. The high-performance SnO 2 -M-O V - T gas sensors display a broad application prospect in the real-time monitoring NO 2 industrial field.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2026
·
IF 5.1
Yufang Cui,Wanyin Ge,Maohao Yang,Xin Dong,Bochuan Zhang
Breakthrough: Ag/Cu bimetallic sensitization and UV activation enables efficient room-temp NO 2 detection. • High response (2180 to 200 ppm NO 2 ) with fast 7/10 s response/recovery at RT under UV. • High selectivity and moisture resistance, integrated into smart masks for breath-level detection. Metal oxide semiconductor (MOS) NO 2 gas sensors are hindered from achieving high-performance, low-power practical applications due to their slow response/recovery times and excessively high operating temperatures. To overcome these obstacles, we propose a synergistic strategy combining silver/copper (Ag/Cu) bimetallic nanoparticle surface modification with ultraviolet (UV) light activation. Using NH 2 -MIL-68 as a sacrificial template, In 2 O 3 rod-like materials were prepared via a hydrothermal method, and Ag/Cu bimetallic nanoparticles were further decorated on their surface to construct a high-performance NO 2 sensor (Ag/Cu-In 2 O 3 ) capable of operating at room temperature. Under UV light excitation, the Ag/Cu-In 2 O 3 -1 sensor exhibited a high response of 2180 toward 200 ppm NO 2 , with response and recovery times as short as 7 s and 10 s, respectively. Moreover, the sensor showed excellent selectivity for NO 2 against various interfering gases and good humidity tolerance. The enhanced performance is attributed to the synergistic sensitization of Ag/Cu bimetallic nanoparticles and the photogenerated holes induced by UV illumination during response and recovery. This study highlights the potential of Ag/Cu-In 2 O 3 for room-temperature NO 2 sensing and demonstrates the effectiveness of UV excitation in boosting MOS gas sensor performance. Download: Download high-res image (135KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yan Tong,Pengkai Xing,Wenbo Ruan,Xiaopeng Wang,Rui Zhang,Weixin Lv,Muhammad Ikram,Xue Bai,Qin Guo,Keying Shi
Room-temperature (RT) detection of NO 2 remains challenging because low-temperature operation often limits surface reactivity and charge-transport modulation. Here, a noble-metal-decorated hollow cage-like oxide is constructed by integrating a template-assisted route with hydrothermal processing, yielding a cauliflower-like architecture with a high specific surface area and abundant, accessible adsorption sites for NO 2 capture. Surface decoration further enriches oxygen vacancies and enhances the oxygen storage capacity, promoting oxygen activation and NO x surface chemistry under ambient conditions. Meanwhile, the formation of a Schottky barrier between Pd and CeO 2 enhances the conductivity and electron mobility of the composite. As a result, the chemiresistive sensor delivers a response of 32.84 toward 100 ppm NO 2 at room temperature, with a 3 s response and 15 s recovery, while maintaining good selectivity, repeatability, and long-term stability. The device further achieves a 30 ppb detection limit, highlighting this hollow, vacancy-rich microcage platform as an effective strategy for low-power NO 2 monitoring. This work provides a generalizable interface and defect engineering strategy for next-generation RT NO 2 sensors.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Saisai Zhang,Yi Zheng,Bo Zhang,Bowen Zhang,Na Luo,Yan Wang
Since nitrogen dioxide (NO 2 ) is an air pollutant that can seriously harm human health, developing high-performance gas sensors capable of efficiently detecting nitrogen dioxide at room temperature is of great significance for environmental monitoring and health protection. In this work, we synthesized hierarchical spherical MoS 2 with a high specific surface area via a hydrothermal method and uniformly loaded Pd nanoparticles onto its surface through an in-situ reduction strategy, successfully constructing a Pd/MoS 2 composite material. Characterization techniques including SEM, TEM，XPS confirmed the successful loading of Pd nanoparticles and the electronic interaction between Pd and MoS 2 . Experimental results demonstrate that the 1% Pd/MoS 2 composite exhibits optimal sensing performance toward NO 2 at room temperature: a high response value (Rg/Ra) of 9.33 toward 10 ppm NO 2 , along with excellent selectivity, repeatability, and long-term stability. Density Functional Theory (DFT) calculations further elucidated the enhancement mechanism: the introduction of Pd significantly increased the adsorption energy of NO 2 on the material surface (from −0.253 eV to −1.41 eV), thereby greatly improving the sensor's sensitivity and response kinetics. This research provides an effective material design strategy and theoretical foundation for developing high-performance, low-power-consumption room-temperature NO 2 gas sensors.
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Baoyu Huang,Haochen Zhang,Zhipeng Guan,Shupeng Sun,Yuwei Shan,Wencheng Ma,Nan Wang,Lingchu Huang,Xiaogan Li
NO 2 is an important component of air pollution and can have a significant impact on the environment and human respiratory health. Therefore, the requirement for real-time detection of low-concentration NO 2 from various emission sources drives the development of a specialized gas sensor. In this work, a heterojunction material based on bulk SnTe and In 2 S 3 nanosheets was developed, which can reach the ppb-level detection of NO 2 at room temperature. The sensor based on SnTe/In 2 S 3 exhibits better response (5.56) and a faster response time (58 s) for 1 ppm of NO 2 compared to the original SnTe-based sensor with the response of 1.11 and the response time of 204 s and reaches the detection limit of 75 ppb. The heterojunction sensor exhibits not only enhanced response and low detection limit but also performs improved selectivity, repeatability and long-term stability. The comprehensive performance enhancements result from both the promoted charge transfer due to the SnTe/In 2 S 3 heterojunction and abundant surface-adsorbed oxygen. The sensing mechanisms were studied through the use of in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and electrochemical impedance spectroscopy.
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yanhui Sun,Dongye Han,Shupeng Sun,Yuhua Dong,Xiaogan Li,Kehan Qian
The semiconductor-based sensing materials with hollow and heterojunction structures were demonstrated significant advantages in critical performance metrics including sensitivity, operating temperature, and response/recovery time. In this study, the urchin-like dual-shelled ZnO/SnO 2 hollow spheres were effectively fabricated using a two-step hydrothermal approach. Compared with pure ZnO, the prepared ZnO/SnO 2 material exhibits a larger specific surface area, and abundant interface contact sites, showing significant improvements in NO 2 gas detection. Through the formation of hollow ZnO/SnO 2 heterojunctions, the optimal operating temperature has been successfully decreased from 150℃ to 65℃. Additionally, the ZnO/SnO 2 sensor exhibits a response of 449.4–10 ppm NO 2 , which is 8.7 times that of the ZnO-based sensor. Moreover, this sensor demonstrates a fast response/recovery time (47/50 s) and long-term stability of 60 days. Selective tests confirmed the high specificity of the ZnO/SnO 2 sensor to NO 2 gas (S nitrogen dioxide /S ammonia = 345.7). Additionally, the adsorption behaviors of NO 2 on the ZnO/SnO 2 heterojunction and ZnO surface were analyzed using density functional theory (DFT) calculations, providing theoretical insights for optimizing the performance of hollow core-shell structured sensors.
研究领域:
材料科学
·
传感器与检测技术
·
纳米技术
·
气体传感
·
半导体材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）